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JEE Main 2014 Physics question

PhysicsDual Nature of Matter and RadiationJEE Main 2014

A beam of light has two wavelengths of 4972Å and 6216Å with a total intensity of W equally distributed among the two wavelengths. The beam falls normally on an area of 1 of a clean metallic surface of work function 2.3eV. Assume that there is no loss of light by reflection and that each capable photon ejects one electron. The number of photoelectrons liberated in 2 s is approximately:

Answer: (2)

Solution

Photon energies are eV and eV. Only the 4972 Å photons exceed the 2.3 eV work function. The power in that half of the beam is

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Question ID VK-104551